Appendix CRF - Part 3 - Northamptonshire County Council

Scenario Annual Dose Criteria Public Worker Assessment Capacity
Used for Assessment
Constraint?
Exposure from Gas 0.02 mSv/yr Public (GRA) x 8.10
Considered as a
Generation from the
Annex B potential
Landfill
constraint to
landfill capacity
Exposure to Wildlife 10 microgray/hr x x 8.11
Not used to
from all sources
Annex B define landfill
capacity
External dose from 0.02 mSv Public (GRA) x 8.12
Not considered
emplaced wastes
Annex B as a constraint
to landfill
capacity
because the
resulting doses
are trivial
Post –Closure not expected to occur
Exposure by Using 3 mSv Public (GRA and x 8.13
Has the potential
Groundwater from a HPA)
Annex B to be a
Borehole
constraint to
Constructed at the
Boundary of the
Landfill
landfill capacity
Exposure by 3 mSv Public or Worker 8.14
Has the potential
Intrusion into the (GRA and HPA)
Annex B to be a
Emplaced Waste
constraint to
Post Closure of the
Landfill
landfill capacity
Other potential scenarios are discussed in Annex B and have not been assessed for documented reasons.
8.0.5 Some other potential scenarios are discussed in Annex B and have not been
assessed for documented reasons. Additionally:
- The aircraft crash scenario is discussed with the dropped load scenario.
- A scenario involving drilling into the waste form for construction of new
sampling or leachate wells is not discussed because this would be
executed with knowledge under appropriate regulations with appropriate
precautions as necessary.
- The effects of very long term climate change are not assessed because
the site is already permitted as a hazardous site and LLW disposal gives
rise to no additional considerations in respect of flooding, coastal erosion
or sea level rises. Future glaciation would have similar or lesser effects
than the “residential intrusion scenario” considered in 8.14.
- The effects of seismic events. The engineered containment structures at
the site are not formed of brittle materials such as concrete that may
fracture as a result of a severe earthquake. The HDPE and clay lining
materials have a high shear strength and have the flexibility to withstand
Application for disposal of LLW including HV-VLLW under RSA 1993,
for the East Northants Resource Management Facility:
Supporting Information
July 2009
58
WS010001/ENRMF/CONSAPPCRF 377